??REPLACEMENT FOR??2016 Coolster 49cc Pit Bike||2 Stroke 43cc 47cc 49cc Gas Scooter Mini Pocket Bike; ??SIZE??Cylinder inner diameter:44mm/1.7″;(As the picture shows) ??EASY TO INSTALL??Replacement piston sets engineered from premium materials to provide exceptional service life and reliability. Pistons gasket kit with precise density to provide a reliable seal with minimal tightening; ??NOTE??Please verify model number and size prior to ordering to ensure this is the correct part; ??WOOSTAR CUSTOMER SERVICE??Always available to help our customers.Please message us for replacement or refund if you are not satisfied with the order;Be happy Online in your time. Color:Cylinder ABOUT WOOSTAR DIRECT US WOOSTAR has been engaged in Automotive for more than 10 years. With over 200 staff,also we have rich experience and excellent product quality. The main products are recoil pull start,chain master link,carburetor,hand brake lever,ignition coil,intake gasket,sprocket,hand puller,rearview mirror and so on. Each month will list a lot New products.We also accept customization of products if you buy enough.Please follow closely with our store. ABOUT BRAND We have registered the brand 2.0 successfully by Amazon Brand: WOOSTAR Registration Number: 5364654 FEATURE Package Included : 1 X Cylinder Fit Model: Replacement for 2016 Coolster 49cc Pit Bike 2 Stroke 43cc 47cc 49cc Gas Scooter Mini Pocket Bike Tip : Please verify model number and size prior to ordering to ensure this is the correct part for your engine Customer Services : Message us for further assistance if have any question or problem with the product.We will be very glad that can help you